CVE-2023-39456

Name: CVE-2023-39456
Creator: NVD / NIST
Published: 2023-10-17T07:15:09.737+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 53.48%

Last modified Jun 17, 2026

CVE-2023-39456 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2. Users are recommended to upgrade to version 9.2.3, which fixes the issue.. EPSS estimates a 53.48% chance of exploitation in the next 30 days.

Description

Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2. Users are recommended to upgrade to version 9.2.3, which fixes the issue.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

53.48%

98.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Apache	Traffic Server	>= 9.0.0, < 9.2.3
Fedoraproject	Fedora	37
Fedoraproject	Fedora	38

References

Timeline

Published: Oct 17, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-39456?

How severe is CVE-2023-39456?

CVE-2023-39456 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 53.48% probability of exploitation in the next 30 days.

How do I fix CVE-2023-39456?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-39456?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST